Abstract
Converting
poly(ethylene
terephthalate)
(PET)
into
metal–organic
frameworks
(MOFs)
has
emerged
as
a
promising
innovation
for
upcycling
of
waste
plastics.
However,
previous
solvothermal
methods
suffer
from
toxic
solvent
consumption,
long
reaction
time,
high
pressure,
and
temperature.
Herein,
mechanochemical
milling
strategy
was
reported
to
transform
PET
series
MOFs
with
yields.
This
had
the
merits
solvent‐free
conditions,
ambient
temperature,
short
running
easy
scale‐up
large‐scale
production
MOFs.
The
as‐prepared
exhibited
definite
crystal
structure
porous
morphology
composed
agglomerated
nanoparticles.
It
proven
that,
under
milling,
firstly
decomposed
1,4‐benzenedicarboxylate,
which
acted
linkers
coordinate
metal
ions
forming
fragments,
followed
by
gradual
arrangement
fragments
work
not
only
promotes
value‐added
conversion
polyesters
but
also
offers
new
opportunity
produce
in
green
scalable
manner.
Chemical Reviews,
Год журнала:
2023,
Номер
123(9), С. 5612 - 5701
Опубликована: Март 14, 2023
Plastics
are
everywhere
in
our
modern
way
of
living,
and
their
production
keeps
increasing
every
year,
causing
major
environmental
concerns.
Nowadays,
the
end-of-life
management
involves
accumulation
landfills,
incineration,
recycling
to
a
lower
extent.
This
ecological
threat
environment
is
inspiring
alternative
bio-based
solutions
for
plastic
waste
treatment
toward
circular
economy.
Over
past
decade,
considerable
efforts
have
been
made
degrade
commodity
plastics
using
biocatalytic
approaches.
Here,
we
provide
comprehensive
review
on
recent
advances
enzyme-based
biocatalysis
design
related
processes
recycle
or
upcycle
plastics,
including
polyesters,
polyamides,
polyurethanes,
polyolefins.
We
also
discuss
scope
limitations,
challenges,
opportunities
this
field
research.
An
important
message
from
that
polymer-assimilating
enzymes
very
likely
part
solution
reaching
Microplastics
are
an
emergent
yet
critical
issue
for
the
environment
because
of
high
degradation
resistance
and
bioaccumulation.
Unfortunately,
current
technologies
to
remove,
recycle,
or
degrade
microplastics
insufficient
complete
elimination.
In
addition,
fragmentation
mismanaged
plastic
wastes
in
have
recently
been
identified
as
a
significant
source
microplastics.
Thus,
developments
effective
removal
methods,
well
as,
plastics
recycling
strategies
crucial
build
microplastics-free
environment.
Herein,
this
review
comprehensively
summarizes
eliminating
from
highlights
two
key
aspects
achieve
goal:
1)
Catalytic
into
environmentally
friendly
organics
(carbon
dioxide
water);
2)
catalytic
upcycling
monomers,
fuels,
valorized
chemicals.
The
mechanisms,
catalysts,
feasibility,
challenges
these
methods
also
discussed.
Novel
such
photocatalysis,
advanced
oxidation
process,
biotechnology
promising
eco-friendly
candidates
transform
benign
valuable
products.
future,
more
effort
is
encouraged
develop
conversion
products
with
efficiency,
product
selectivity,
low
cost
under
mild
conditions.
Advanced Energy Materials,
Год журнала:
2022,
Номер
12(22)
Опубликована: Апрель 21, 2022
Abstract
Plastic
waste
remains
a
global
challenge
due
to
the
massive
amounts
being
produced
without
satisfactory
treatment
technologies
for
recycling
and
upcycling.
Photocatalytic
processes
are
emerging
as
green
promising
approaches
upcycle
plastics
into
value‐added
products
under
mild
conditions
using
sunlight
energy
source.
In
this
review,
recent
advances
in
plastic
conversion
through
photocatalysis
have
been
comprehensively
summarized.
Special
emphasis
is
placed
on
photocatalytic
mechanism
selective
CC
CH
bond
transformations
of
access
fuels,
chemicals,
materials.
Finally,
challenges
perspectives
establishing
new
paradigm
toward
sustainable
circular
economy
also
put
forward.
ACS Catalysis,
Год журнала:
2022,
Номер
12(24), С. 14882 - 14901
Опубликована: Ноя. 23, 2022
Polyolefins,
the
largest
used
commodity
plastics
in
world,
find
extensive
application
many
fields.
However,
most
end
up
landfills
or
incineration,
leading
to
severe
ecological
crises,
environmental
pollution,
and
serious
resource
waste
problems.
As
representatives
on
chemical
upcycling
of
polyolefin
fuels
bulk/fine
chemicals,
catalytic
cracking
hydrocracking
based
zeolite
metal/zeolite
composite
catalysts
are
considered
effective
paths
due
their
large
capacity
strong
adaptability
existing
petrochemical
equipment.
After
an
overview
reaction
mechanisms
pyrolysis
cracking,
this
review
aims
comprehensively
discuss
influence
catalyst
structure
(acidity,
pore
structure,
morphology)
activity,
selectivity,
stability
particularly
emphasizing
importance
for
matching
acidity
target
product
formation.
Subsequently,
structure–activity
relationship
between
metal
site
zeolite's
acid
is
also
discussed.
In
end,
emerging
opportunities
challenges
proposed
promote
a
more
efficient
way
upcycling.
Plastic
waste
is
an
emerging
environmental
issue
for
our
society.
Critical
action
to
tackle
this
problem
upcycle
plastic
as
valuable
feedstock.
Thermochemical
conversion
of
has
received
growing
attention.
Although
thermochemical
promising
handling
mixed
waste,
it
typically
occurs
at
high
temperatures
(300-800
°C).
Catalysts
can
play
a
critical
role
in
improving
the
energy
efficiency
conversion,
promoting
targeted
reactions,
and
product
selectivity.
This
Review
aims
summarize
state-of-the-art
catalytic
conversions
various
types
waste.
First,
general
trends
recent
development
including
pyrolysis,
gasification,
hydrothermal
processes,
chemolysis
into
fuels,
chemicals,
value-added
materials
were
reviewed.
Second,
status
quo
commercial
implementation
was
summarized.
Finally,
current
challenges
future
perspectives
design
sustainable
robust
catalysts
discussed.
Case Studies in Chemical and Environmental Engineering,
Год журнала:
2024,
Номер
9, С. 100673 - 100673
Опубликована: Фев. 23, 2024
It
is
difficult
to
reuse
wastes
from
polymers
due
the
mismatch
between
amount
of
contaminants
and
secondary
quality
feed.
This
type
operation
much
more
expensive
cost-effective
than
production
polymer
raw
materials
latest
materials.
However,
recyclable
beneficial
if
used
extensively
in
various
concrete
products
wood-polymer
boards.
done
only
cleaning
sorting
are
not
particularly
important
for
products.
Polyethylene
terephthalate
(PET)
a
widely
industries
its
excellent
physical
chemical
properties.
Besides,
increasing
use
PET
has
led
global
crisis
waste
management,
as
improper
disposal
caused
significant
environmental
damage.
major
source
accumulated
landfills,
address
this
issue,
recycling
methods
have
evolved.
In
regard,
present
review
examines
techniques
involved
PET.
Conventional
influence
diverse
depolymerization
reaction
variables
were
discussed,
upsides
downsides
each
technique
considered.
The
summarizes
advances
technologies
plastic
waste,
focusing
on
bio-recycling
PET,
aiming
sustainable,
economical
solutions
circular
economy.
Angewandte Chemie International Edition,
Год журнала:
2022,
Номер
61(43)
Опубликована: Сен. 8, 2022
Closed-loop
recycling
of
polymers
represents
the
key
technology
to
convert
plastic
waste
in
a
sustainable
fashion.
Efficient
chemical
and
upcycling
strategies
are
thus
highly
sought-after
establish
circular
economy.
Here,
we
present
selective
depolymerization
polycarbonate
by
employing
vanillin
derivative
as
bio-based
feedstock.
The
resulting
di-vanillin
carbonate
monomer
was
used
combination
with
various
amines
construct
library
reprocessable
poly(imine-carbonate)s,
which
show
tailor-made
thermal
mechanical
properties.
These
novel
poly(imine-carbonate)s
exhibit
excellent
recyclability
under
acidic
energy-efficient
conditions.
This
allows
recovery
monomers
high
yields
purity
for
immediate
reuse,
even
when
mixed
commodity
plastics.
work
provides
exciting
new
insights
design
produced
minimal
environmental
impact.
